content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.joins;
  
  import java.util.Map;
  import java.util.concurrent.atomic.AtomicReference;
  
  import io.reactivex.rxjava3.core.Observer;
  import io.reactivex.rxjava3.functions.*;
  
  /**
   * Represents an execution plan for join patterns.
   * @param <T1> the first value type
   * @param <R> the result type
   */
  final class Plan1<T1, R> extends Plan<R> {
      protected final Pattern1<T1> expression;
      protected final Function<? super T1, ? extends R> selector;
  
      Plan1(Pattern1<T1> expression, Function<? super T1, ? extends R> selector) {
          this.expression = expression;
          this.selector = selector;
      }
  
      @Override
      public ActivePlan0 activate(Map<Object, JoinObserver> externalSubscriptions, final Observer<R> observer, final Consumer<ActivePlan0> deactivate) {
          Consumer<Throwable> onError = onErrorFrom(observer);
  
          final JoinObserver1<T1> firstJoinObserver = createObserver(externalSubscriptions, expression.o1(), onError);
  
          final AtomicReference<ActivePlan1<T1>> self = new AtomicReference<>();
  
          ActivePlan1<T1> activePlan = new ActivePlan1<>(firstJoinObserver, new Consumer<T1>() {
              @Override
              public void accept(T1 t1) {
                  R result;
                  try {
                      result = selector.apply(t1);
                  } catch (Throwable t) {
                      observer.onError(t);
                      return;
                  }
                  observer.onNext(result);
              }
          },
                  new Action() {
                      @Override
                      public void run() throws Throwable {
                          ActivePlan0 ap = self.get();
                          firstJoinObserver.removeActivePlan(ap);
                          deactivate.accept(ap);
                      }
                  });
  
          self.set(activePlan);
  
          firstJoinObserver.addActivePlan(activePlan);
          return activePlan;
      }
  
  }
  